CN1837575A - Processing technology for extracting oil from metamorphic rock high pour point oil of burial hill by using combustion drive in horizontal well - Google Patents
Processing technology for extracting oil from metamorphic rock high pour point oil of burial hill by using combustion drive in horizontal well Download PDFInfo
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Abstract
The invention relates to a method for using horizontal well to extract oil in the fire flooding metamorphic rock burial hill high-density oil accumulation, which uses fire flooding technique and drill horizontal well on the oil of crank to extract oil. The invention can reach more than 10% of extraction rate, and it can combine the character of high-density oil and the ground temperature to process the oil extraction in vertical section. The invention has simple process and higher reliability.
Description
Technical field:
The present invention relates to a kind of fireflood metamorphic rock buried hill height and coagulate the technology that oil reservoir utilizes horizontal well production, belong to fire flood exploitation buried hill height and coagulate oily method class.
Background technology:
The viscous crude of Liaohe Oil Field, the high oilreserves that coagulates accounts for gross reserves 60%, the exploitation of main dependence steam soak, because some fault-block oilfield heavy oil blocks bury more shallow at present, thin interbed is many, thickened oil recovery is in the later stage in steam soak stage, show the recovery percent of reserves height, the round of handling up height, strata pressure is low, the characteristics such as oil-gas ratio is low of handling up, as proceed steam soak and be difficult to obtain favorable economic benefit, be example with the 66# district of Shuguang Oilfield, current average reservoir pressure is 1.05MPa, total pressure head reaches 9.77MPa, now entered and can't set up the driving pressure difference stage, caused the steam soak deleterious, recovery percent of reserves only is 20.4%.Du 163# district recovery percent of reserves is up to 34.8%, movably seldom with the remaining oil in the oil in place, as continue to adopt steam soak, the effect of handling up is very undesirable, on average the cycle of handling up has only the 7-8 cycle, several 162 mouthfuls of the well of handling up more than 7 weeks, account for total well several 71.7%, the cycle oil-gas ratio is lower than 0.2 oil well that can not handle up and reaches 161 mouthfuls, accounts for 71.2% of oil well sum, and aclosed well has reached 95 mouthfuls more than at present, account for 42.2% of oil well sum, ordinary production Jing133Kou, average mouthful of product also has only 1.1t/d, and above-mentioned oil well is as continuing to adopt steam flooding hot water flooding and flue gas flooding again, be difficult to obtain better effects, make whole block ton oil running cost improve, crude oil cost moves on 8 dollars/barrel, and economic benefit is very not good.Therefore utilize fire flood to viscous crude, the exploitation of high oil with fixed attention is optimal selection, it is introduced that fire flood compares with steam drive oil production, the clear superiority of fire flood is that displacement of reservoir oil speed responsing is fast, utilize the interior crude oil heavy composition of oil reservoir to do fuel during fireflood, burning is given birth to heat and the oil reservoir crude oil that injects in the oil well is displaced in another mouthful producing well flow out ground, fireflood output in the world's is about 5000t/d at present according to statistics, mainly concentrate on the U.S., Romania, states such as Venezuela, facts have proved, fireflood can be from the light oil oil reservoir that water drive is crossed the extraction substantial oil, the fireflood recovery ratio of world oil-producing country success can reach 50-80%, the oil of fireflood at present mode is primarily aimed at 500-900 rice left and right sides thin oil well at home and abroad and is distributed in low viscous oil well crude oil in the sand body, and carry out in the higher vertical wells of some in-place permeabilities, utilize horizontal well to carry out 15 meters of the thick sandstone oil reservoirs of the F-ROSERAY thickness in west, the fireflood oil reasonable Canadian Bactrum oil field of effect, wherein 610 meters of extended horizontal depths of three mouthfuls of water horizontal wells have been bored altogether, " the oil pipe slotted liner completion; the net horizontal section both sides are 870 meters and 550 meters with the distance of injecting well, and this horizontal well current production rate is 62.1 meters that adopts 5
3Be ten times of adjacent straight well, the horizontal well oil-gas ratio is 18 meters
3, straight well is 350 meters
3Horizontal well production was 16745 meters in the 10th year
3, also only produce 3365 meters and near straight well began to produce crude oil in 1 year
3At present domestic rock on the turn buried hill height coagulates in the crack in the oily root of Dahurian angelica and carries out fire flood, owing to be subjected to the little close restriction of lithology, production technique is very difficult, still study, in addition, the oil well sparking mode mostly adopts electrical heating or liquefied gas and chemical mode to light a fire in a bite well in the peupendicular hole of cut sand rock mass, as five Oilfield using of domestic Xinjiang Oilfield and Ma Jiapu mausoleum, Liaohe Oil Field cable be connected heater and send into air, because heating-up temperature is wayward, the downhole technique complexity, burn out easily, heating cable is not succeeded, and a kind of to coagulate oil viscosity at the Liaohe Oil Field viscous crude big, the blocks buried hill oil root of Dahurian angelica characteristics that freezing point is high, and a kind of fireflood metamorphic rock buried hill of the present invention that proposes, height coagulates the technology that the oily root of Dahurian angelica utilizes horizontal well production, is not reported so far.
Summary of the invention:
Purpose of the present invention is in order to overcome above-mentioned shortcoming, and a kind of fireflood metamorphic rock buried hill height that provides coagulates the technology that oil reservoir utilizes horizontal well production, this technology is to utilize in the rock mass of rock buried hill in the metamorphic rock buried hill body internal fissure heavy composition to do fuel on the turn, injecting into well by injecting the high temperature air mode, it is drawn burning, give birth to the pyrogen reason according to burning then, a kind of technology mode that crude oil with high solidifying point in other a bite level of production well section crack is displaced ground.
Technical solution of the present invention:
Be the task of realizing that the present invention proposes, technology involved in the present invention comprises the steps:
One, the fire flood reservoir physical property is selected
Indication physical parameter of the present invention is:
Rock parameter:
The buried hill lithology should be metamorphic rock, shallow particle rock matter migmatite, granulite matter kataclastics, biotite, shallow particle rock matter kataclastics, and there are a large amount of diabases to invade in the rock mass of buried hill, it is the dual media that cracked matter hole and micropore are arranged in the crack that the buried hill hole has diaclase, and the oil reservoir shape is block buried hill.
Rock environment is in the metamorphic rock buried hill: 1, weathered zone, 2, the high fracture development band of the angle of elevation (inclination angle is less than 70 degree), 3, middle angle fracture development band (fracture dip is between the 30-70 degree), 4, low angle horizontal fracture band (fracture dip less than 30 degree), 5, crack agensis band.
Height coagulates oily physical parameter in the buried hill:
Oil density: 0.85-0.93g/cm3, freezing point: the 32-52 degree contains cured: 27.5-36.1%, viscosity: 23.31-118.48mPa.S in the time of 50 ℃, colloidal bitumen: 11.95-26.52%.
Two, it is definite that fireflood metamorphic rock buried hill height coagulates oil reservoir horizontal production well oil recovery hole condition:
1, horizontal production well should be chosen in the vertical microfissure growth in metamorphic rock reservoir bodies crack, the buried hill section, and the net horizontal section direction of being bored is wanted vertical scar fracture strike, so that drill more multiple cracking to greatest extent, and then enlarges the net horizontal section drainage area.
2, the horizontal production well position is determined in moveable oil band position, buried hill:
1. oil well well depth ground temperature is greater than 45 ℃ Celsius, and temperature is coagulated oil freezing point greater than height, flows under field conditions (factors) to keep the oil in the crack;
2. scar low angle fracture development band, fracture dip is less than 30 degree;
3. this well area formation testing, and have fuel-displaced history;
4. horizontal well drilling recovers the oil;
3, injecting air well selects:
1. inject air well and be chosen on the net horizontal section, promptly vertically to the distance at 5-10 rice;
2. inject air well and be chosen in horizontal well two end distance horizontal well plan range 200-300 rice;
3. gas injection well number: 3-5 mouth well is one group (wherein 2 mouthfuls of gas recovery wells are interior);
4. inject air well and will carry out the position selection according to fractuer direction;
5. inject air well, the oil recovery producing well all adopts the dual-string completion technology, can prevent to burn out tubing string, and marginal not water reduces the tubing string temperature during fireflood work;
6. the horizontal production well of recovering the oil completion adopts the slotted casing completion can increase the oil-feed duct to greatest extent.
Three, ignition layer is selected:
1, is chosen in the injection air well, between the above 5-10 rice of net horizontal section vertical distance in this ignition layer distance of positions oil recovery level of production well;
2, ignition layer thickness should be determined according to 1/10th thickness that oil well is penetrated out gross thickness;
3, the i.e. 12 hole/rice of sleeve pipe perforation density behind perforation in ignition layer position, eye diameter guarantee to have enough oil flow channels more than 9 millimeters like this.
After above-mentioned condition satisfies, inject into well with electric heater and air compression carrying out fire flood igniting at air, in horizontal production well, recover the oil according to the fire flood reservoir parameter.
Described fire flood reservoir parameter is:
Igniting is that air injects well, gas recovery well apart from horizontal well apart between 100-150 rice, igniting reservoir depth 900-1300 rice, more than ignition layer thickness 1-2 rice, the formation fracture inclination angle is less than 30 degree.
Described ignition heater implantation temperature is more than 250 ℃, injection pressure: 3MPa-25MPa.
The advantage that the present invention compared with prior art has is:
The present invention exploits by horizontal well owing to utilizing fireflood that the height in the metamorphic rock buried hill of buried hill is coagulated oil reservoir, height in its crack, buried hill is coagulated the oil drop combustion, do fuel and constantly give birth to heat with heavy composition in the oil reservoir during burning, finally by horizontal well the crude oil in the oil reservoir is displaced ground again, thereby solved the buried hill type of reservoir because permeability is low, degree of porosity is little, the crack oil reservoir can't be exploited a difficult problem, specific energy can be bigger mutually utilizes horizontal well and crack, buried hill contact surface for the fire flood producing well of this method and vertical drilling, it is long-pending to have increased the fireflood pasta undoubtedly, make recovery ratio improve more than 20%, in addition, since high characteristic (the high oil freezing point that coagulates is between 32-50 Celsius ℃) of coagulating oil freezing point therefore, can carry out height at buried hill rock temperature 32-50 ℃ vertical zonation optional position horizontal well drilling and coagulate the oil exploitation, increased recovery ratio, technology of the present invention can enlarge oil in place, adds up according to the Liaohe Oil Field, owing to use this process, make the oil field increase oil in place more than 1,000 ten thousand tons.In addition, the present invention has adopted air to inject the sparking mode of well and air extraction well, can make fireflood oil have the good ventilation condition when burning, guarantees that burning zone is in fired state steady in a long-term.
Description of drawings:
Accompanying drawing 1 is that the metamorphic rock buried hill height coagulates oily root of Dahurian angelica distribution map.Accompanying drawing 2 is to inject air well, gas recovery well level of production well well spacing plan view.Accompanying drawing 3 is to inject air well, gas recovery well, horizontal production well structural representation.
In the accompanying drawing by 1, by the oil recovery horizontal well, 2, gas recovery well, 3, inject air well, 4, two-tube, 5, can not transfer the oil band, 6, the moveable oil band, 7, packer, 8, the buried hill body forms.
The specific embodiment:
The present invention is provided by following examples, below in conjunction with accompanying drawing the present invention is described further.
Embodiment 1:
Among Fig. 1, describe the metamorphic rock buried hill height among the figure and coagulated oily root of Dahurian angelica distribution, before fireflood oil, will be clear that the physical parameter of understanding buried hill internal construction mechanism by geologic information, be that buried hill lithology is a metamorphic rock, shallow particle rock matter migmatite, shallow particle rock kataclastics etc., and the scar zonation distinguished such as weathered zone, the fracture development band, Data acquisition,s such as low angle level band are complete, its objective is that the height of grasping in the crack, buried hill by above-mentioned data coagulates oil content cloth zone, in general in the rock of buried hill more than 1000 meters ground temperature less than Celsius 45 the degree, be called non-movable oil band 5, and 1300-1400 rice interval, the ground temperature is about 53 ℃, be moveable oil band 6, should meanwhile, also should grasp this section and whether have high oil and this Duan Gaoning oil physical parameter thereof of coagulating with well pattern cloth in moveable oil band 6 districts during well spacing by the formation testing result.
Embodiment 2:
Determine horizontal producing well 1 well location according to the geologic information among the embodiment 1:
Horizontal producing well 1 is chosen in stratigraphic dip and vertical microfissure is grown in the section, and the net horizontal section direction is wanted vertical rock fracture trend, enlarges drainage area so that pass formation fracture to greatest extent.
The oil well well depth is positioned at the above position of ground temperature 45 degree Celsius, and the height of this position coagulates oil and be the nature flow regime in stratum moveable oil band 6.
In the development belt of rock stratum, fracture dip is optimum level well location district less than 30 degree.
Embodiment 3:
Definite (Fig. 2) of fire flood ignition well:
Fireflood metamorphic rock buried hill height coagulates oily root of Dahurian angelica horizontal well 1 when recovering the oil, except that horizontal well drilling 1 recovers the oil, inject air at injection air well 3 in the time of also must on the horizontal segment layer position of horizontal well, boring air injection well 3 with gas recovery well 2 igniting, gas recovery well 2 vented exhausts, to form thermal field the high oil that coagulates is heated up, after be in steady flow condition, during oil recovery, by extraction in the oil recovery horizontal well 1 (Fig. 3).
Claims (3)
1, a kind of fireflood metamorphic rock buried hill height coagulates the technology that oil reservoir utilizes horizontal well production,
It is characterized in that: described technology comprises the steps:
One, the fire flood reservoir physical property is selected
Indication physical parameter of the present invention is:
Rock parameter:
The buried hill lithology should be metamorphic rock, shallow particle rock matter migmatite, granulite matter kataclastics, biotite, shallow particle rock matter kataclastics, and there are a large amount of diabases to invade in the rock mass of buried hill, it is the dual media that cracked matter hole and micropore are arranged in the crack that the buried hill hole has diaclase, and the oil reservoir shape is block buried hill;
Rock environment is in the metamorphic rock buried hill: 1, weathered zone, 2, the high fracture development band of the angle of elevation (inclination angle less than 70 degree), 3, middle angle fracture development band, (fracture dip is between the 30-70 degree), 4, low angle horizontal fracture band (fracture dip less than 30 degree), 5, crack agensis band;
Height coagulates oily physical parameter in the buried hill:
Oil density: 0.85-0.93g/cm3, freezing point: the 32-52 degree contains cured: 27.5-36.1%, viscosity: 23.31-118.48mPa.S in the time of 50 ℃, colloidal bitumen: 11.95-26.52%;
Two, it is definite that fireflood metamorphic rock buried hill height coagulates oil reservoir horizontal production well oil recovery hole condition:
(1), horizontal production well should be chosen in the vertical microfissure in metamorphic rock reservoir bodies crack, buried hill and grow in the section, the net horizontal section direction of being bored is wanted vertical scar fracture strike, so that drill more multiple cracking to greatest extent, and then enlarges the net horizontal section drainage area;
2), the horizontal production well position is determined in moveable oil band position, buried hill:
1. oil well well depth ground temperature is greater than 45 ℃ Celsius, and temperature is higher than the high oil freezing point that coagulates, and coagulates oil with the height in the maintenance crack and flows under field conditions (factors);
2. scar low angle fracture development band, fracture dip is less than 30 degree;
3. this well area formation testing, and have fuel-displaced history;
4. horizontal well drilling recovers the oil;
(3), injecting air well selects:
1. inject air well and be chosen on the net horizontal section, promptly vertical distance is at 5-10 rice;
2. inject air well and be chosen in the horizontal well both sides apart from horizontal well plan range 200-300 rice;
3. gas injection well number: 3-5 mouth well is one group (comprising 2 mouthfuls of gas recovery wells interior);
4. inject air well and carry out the position selection according to fractuer direction;
5. inject air well, the oil recovery producing well all adopts the dual-string completion technology, can prevent to burn out oil well pipe, but during work in well marginal not water reduce the tubing string temperature;
6. the horizontal production well of recovering the oil completion adopts the slotted casing completion can increase the oil-feed duct to greatest extent;
Three, ignition layer is selected:
(1), is chosen in and injects air well, between the above 5-10 rice of net horizontal section vertical distance in this ignition layer distance of positions oil recovery level of production well;
(2), ignition layer thickness should be determined according to 1/10th thickness that oil well is penetrated out gross thickness;
(3), the i.e. 12 hole/rice of sleeve pipe perforation density behind perforation in ignition layer position, eye diameter guarantees to have enough oil flow channels more than 9 millimeters like this;
Above-mentioned condition satisfies the back according to the fire flood reservoir parameter, injects into well with electric heater and air compressor at air and carries out the fire flood igniting, recovers the oil in horizontal production well.
2, a kind of fireflood metamorphic rock buried hill height according to claim 1 coagulates the technology that oil reservoir utilizes horizontal well production, it is characterized in that: described fire flood reservoir parameter is: igniting is that air injects well, gas recovery well apart from horizontal well apart between 100-150 rice, igniting reservoir depth 900-1300 rice, more than ignition layer thickness 1-2 rice, the formation fracture inclination angle is less than 30 degree.
3, a kind of fireflood metamorphic rock buried hill height according to claim 1 coagulates the technology that oil reservoir utilizes horizontal well production, and it is characterized in that: described ignition heater implantation temperature is at injection pressure: 3MPa-25MPa more than 250 ℃.
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| CN103161437A (en) * | 2013-03-05 | 2013-06-19 | 中国石油天然气股份有限公司 | Fleeing sealing sand-prevention ignition method of fireflooding oil extraction |
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| US5211230A (en) * | 1992-02-21 | 1993-05-18 | Mobil Oil Corporation | Method for enhanced oil recovery through a horizontal production well in a subsurface formation by in-situ combustion |
| US5626191A (en) * | 1995-06-23 | 1997-05-06 | Petroleum Recovery Institute | Oilfield in-situ combustion process |
| WO1999030002A1 (en) * | 1997-12-11 | 1999-06-17 | Petroleum Recovery Institute | Oilfield in situ hydrocarbon upgrading process |
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| CN103628848A (en) * | 2013-12-02 | 2014-03-12 | 中国地质大学（武汉） | Multidirectional interlayer water flooding displacement oil extraction method and system |
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